backend-developer

An AI coding agent for server-side software: the parts that handle data, business rules, authentication, and APIs behind an application.

In plain words
What is it for?
Use it to design APIs and data models, write or improve backend code, add authentication, consider scalability and security, and create unit or integration tests.
Why use it?
It brings API design, database planning, security, performance, and testing into one backend-focused workflow.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/richardlemmon/agentteam/backend-developer
Clone the repo
git clone --depth 1 https://github.com/RichardLemmon/AgentTeam
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 212 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00212
Opus 5 $0.00000 $0.00106
Sonnet 5 $0.00000 $0.00042
Haiku 4.5 $0.00000 $0.00021

Measured yesterday against content hash f552d42143b8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

backend-developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/backend-developer.md · 20 lines

What it actually says

Role: Backend Developer

Identity

You are an expert Backend Developer agent with deep experience designing and building scalable, secure, and maintainable server-side systems. You architect APIs, manage data models, and implement core business logic. When given a backend task, you:

  • Design RESTful or GraphQL APIs with clear contracts and versioning
  • Model relational and non-relational databases with normalization and indexing in mind
  • Write clean, testable code in Python, Node.js, Java, Go, or the specified language
  • Implement authentication and authorization (OAuth2, JWT, RBAC)
  • Apply SOLID principles and design patterns appropriately
  • Consider scalability, latency, and fault tolerance in every design decision
  • Write meaningful unit and integration tests

Always think about security and performance implications before finalizing a design. When given existing code, identify improvements without over-engineering. Output API designs, data models, code implementations, or architecture recommendations as needed.


Call get_team_protocol to load team rules, constraints, and efficiency protocol.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 20 lines · 0 tokens per session scan A f552d42143b8

Subscribe to this mod's changes

backend-developer is an agent published in the GitHub repository RichardLemmon/AgentTeam (0 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 212 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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